/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.wanbatv.wangwangba.util;

import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.Build;
import android.text.TextUtils;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;
import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/** Junk drawer of utility methods. */
final public class Util {
  static final Charset US_ASCII = Charset.forName("US-ASCII");
  static final Charset UTF_8 = Charset.forName("UTF-8");

  private Util() {
  }

  static String readFully(Reader reader) throws IOException {
    try {
      StringWriter writer = new StringWriter();
      char[] buffer = new char[1024];
      int count;
      while ((count = reader.read(buffer)) != -1) {
        writer.write(buffer, 0, count);
      }
      return writer.toString();
    } finally {
      reader.close();
    }
  }

  /**
   * Deletes the contents of {@code dir}. Throws an IOException if any file
   * could not be deleted, or if {@code dir} is not a readable directory.
   */
  static void deleteContents(File dir) throws IOException {
    File[] files = dir.listFiles();
    if (files == null) {
      throw new IOException("not a readable directory: " + dir);
    }
    for (File file : files) {
      if (file.isDirectory()) {
        deleteContents(file);
      }
      if (!file.delete()) {
        throw new IOException("failed to delete file: " + file);
      }
    }
  }

  static void closeQuietly(/*Auto*/Closeable closeable) {
    if (closeable != null) {
      try {
        closeable.close();
      } catch (RuntimeException rethrown) {
        throw rethrown;
      } catch (Exception ignored) {
      }
    }
  }

  public static String getDeviceId(Context context) {
    //获取MAC地址
    WifiManager wm = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
    String dId = wm.getConnectionInfo().getMacAddress();

    if (dId == null || TextUtils.isEmpty(dId)) {
      dId = Build.SERIAL;
    }

    StringBuilder hexString = new StringBuilder();
    //使用MD5对MAC地址进行加密
    MessageDigest m = null;
    try {
      m = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
    }
    if (m != null && dId != null) {
      m.update(dId.getBytes());
      byte[] data = m.digest();
      final int length = data.length;
      for (int i = 0; i < length; i++) {
        int hex = data[i] & 0xff;
        if (hex < 0x10) { //如果不满16位，后八位补0，比如，B => 0B
          hexString.append("0");
        }
        hexString.append(Integer.toHexString(hex));
      }
    }

    return hexString.toString().toUpperCase();
  }
}
